AE Tips 003: AE的3D圖層自動根據Camera的距離遠離調整3D圖層透明度

最近AE Portal NEWS提到一個不錯的AE Expression在Adobe的LiveDocs資料庫關於AE的3D圖層自動根據Camera的距離遠離調整3D圖層透明度的實用Expression
將Expression套用在AE 3D圖層的"opacity"下
Expression內容如下:

startFade = 500; // Start fade 500 pixels from camera.
 endFade = 1500;  // End fade 1500 pixels from camera.
 try{ // Check whether there's a camera.
     C = thisComp.activeCamera.toWorld([0,0,0]);
 }catch(err){ // No camera, so assume 50mm.
     w = thisComp.width * thisComp.pixelAspect;
     z = (w/2)/Math.tan(degreesToRadians(19.799));
     C = [0,0,-z];
 }
 P = toWorld(anchorPoint);
 d = length(C,P);
 linear(d,startFade,endFade,100,0)

其中3D圖層在距離Camera 500 pixels時開始fade out, 在1500 pixels時完全消失!

參考參考!!